document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=712322>Question 712322</A>: <I><SPAN STYLE=\"word-break: break-all;\"> hello there\r<BR>\n" );
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document.write( "i came across this problem in which i coudnt understand how it got to the answer<BR>\n" );
document.write( "half circle inner radius is 6 ft the width of outer radius is 2ft \r<BR>\n" );
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document.write( "find the approximate area \r<BR>\n" );
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document.write( "the answer provided was 43.96 sq ft- \r<BR>\n" );
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document.write( "im assuming the formula used was area of a circle= (pi)r^2 then divide by 2\r<BR>\n" );
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document.write( "pls help \r<BR>\n" );
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document.write( "thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #437916 by </B><A HREF=/tutors/aboutme.mpl?userid=KMST><B>KMST(5328)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=KMST><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=KMST><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=437916\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What you mean is half of the space between two concentric circles,<BR>\n" );
document.write( "the inner one with a 6-foot radius,<BR>\n" );
document.write( "and the outer one with an 8-foot radius:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28300%2C200%2C+-9%2C9%2C-2%2C10%2C%0D%0Agreen%28line%28-9%2C0%2C9%2C0%29%29%2Cblue%28circle%280%2C0%2C6%29%29%2Cred%28circle%280%2C0%2C8%29%29%2C%0D%0Alocate%28-7.2%2C1%2C2%29%2Clocate%28-3.2%2C1%2C6%29%2C%0D%0Alocate%282.8%2C1%2C6%29%2Clocate%286.8%2C1%2C2%29%2C%0D%0Agreen%28line%280%2C-0.2%2C0%2C0.2%29%29%2Clocate%283%2C2.9%2Cred%288%29%29%2C%0D%0Ared%28arrow%282.8%2C2.1%2C0.1%2C0.1%29%29%2Cred%28arrow%283.6%2C2.7%2C6.4%2C4.8%29%29%2C%0D%0Alocate%28-2%2C2.9%2Cblue%286%29%29%2C%0D%0Ablue%28arrow%28-1.5%2C2%2C-0.1%2C0.1%29%29%2Cblue%28arrow%28-2.1%2C2.8%2C-3.6%2C4.8%29%29%0D%0A%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" > The surface area of the space bounded by the two circles (red and blue),<BR>\n" );
document.write( "and the (green) line that splits the circles is calculated to about 43.96,<BR>\n" );
document.write( "when using <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi=3.14 ALIGN=MIDDLE  ALT=\"pi=3.14\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "The surface area of the whole outer circle (in square feet) is<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2A8%5E2 ALIGN=MIDDLE  ALT=\"pi%2A8%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > and half of that is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2A8%5E2%2F2 ALIGN=MIDDLE  ALT=\"pi%2A8%5E2%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The surface area of the whole inner circle (in square feet) is<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2A6%5E2 ALIGN=MIDDLE  ALT=\"pi%2A6%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > and half of that is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2A6%5E2%2F2 ALIGN=MIDDLE  ALT=\"pi%2A6%5E2%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The area we want to calculate (in square feet) is<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2A8%5E2%2F2-pi%2A6%5E2%2F2 ALIGN=MIDDLE  ALT=\"pi%2A8%5E2%2F2-pi%2A6%5E2%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" > or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28pi%2A8%5E2-pi%2A6%5E2%29%2F2 ALIGN=MIDDLE  ALT=\"%28pi%2A8%5E2-pi%2A6%5E2%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28pi%2A8%5E2-pi%2A6%5E2%29%2F2=%2864pi-36pi%29%2F2=28pi%2F2=highlight%2814pi%29 ALIGN=MIDDLE  ALT=\"%28pi%2A8%5E2-pi%2A6%5E2%29%2F2=%2864pi-36pi%29%2F2=28pi%2F2=highlight%2814pi%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=14%2A3.14=highlight%2843.96%29 ALIGN=MIDDLE  ALT=\"14%2A3.14=highlight%2843.96%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > which is accurate enough.<BR>\n" );
document.write( "Using <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi=3.1416 ALIGN=MIDDLE  ALT=\"pi=3.1416\"   DISABLED_style= \"max-width:90%; height:auto;\" > we get <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=14%2A3.1416=43.9824%2C%0D%0Aand+with+a+calculator+that+uses+a+much+more+accurate+value+for+%7B%7B%7Bpi ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "we get<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=14pi=about43.9823 ALIGN=MIDDLE  ALT=\"14pi=about43.9823\"   DISABLED_style= \"max-width:90%; height:auto;\" >  </SPAN>\n" );
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